A current of $1$ ampere flows in a series circuit containing an electric lamp and a conductor of $5\,\Omega $ when connected to a $10\, V$ battery. Calculate the resistance of the electric lamp.

Now if a resistance of $10\,\Omega $ is connected in parallel with this series combination, what change (if any) in current flowing through $5\,\Omega $ conductor and potential difference across the lamp will take place? Give reason.

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$(i)$ $5\,\Omega $ $(ii)$ Calculate the total resistance of the circuit. There will be no change in current flowing through $5 \,\Omega $ conductor. Also there will be no change in potential difference across the lamp either.

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